Development and evalustion of die and container materials. Fourth quarterly progress report, July 1--September 30, 1978

Technical Report · Sun Oct 15 04:00:00 EDT 1978

DOI:https://doi.org/10.2172/6123062· OSTI ID:6123062

Wills, R R; Niesz, D E

Mass spectrometric studies of molten silicon in contact with mullite and x = 0.75 ..beta..' Sialon show that the vapor pressures of Si, Si0, Al, and Al/sub 2/0 species are very similar. In both cases the oxygen solubility is extremely low, but the aluminium content of the silicon is higher for the mullite--silicon system (3 weight percent), compared with 5000 ppm for the x = 0.75 ..beta..' Sialon. The nitrogen concentration (312 ppm) of the silicon is marginally below that for the Si/sub 3/N/sub 4/--silicon system indicating that the addition of aluminium and oxygen to ..beta.. Si/sub 3/N/sub 4/ does stabilize the nitrogen to some extent. Silicon beryllium oxynitrides were fabricated by hot pressing Si/sub 3/N/sub 4/--BeO-SiO/sub 2/ mixtures using three Si/sub 3/N/sub 4/ powders. Single phase materials were obtained with KBI, Inc. and Sylvania SN502 grade powders, but not with Sylvania SN402 grade powder. Preliminary evaluation of the silicon beryllium oxynitride materials with molten silicon did not reveal any attack of these materials. X = 0.75 ..beta..' Sialon did, however, undergo slight attack. It is suggested that the rate of dissolution of aluminium in molten silicon could be affected by whether the Sialon is used in an inert atmosphere or under vacuum conditions.

• Research Organization: Battelle Columbus Labs., OH (USA)
• Sponsoring Organization: DOE
• DOE Contract Number: NAS-7-100-954876
• OSTI ID: 6123062
• Report Number(s): DOE/JPL/954876-4
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140501* -- Solar Energy Conversion-- Photovoltaic Conversion
36 MATERIALS SCIENCE
360601 -- Other Materials-- Preparation & Manufacture
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM
BERYLLIUM COMPOUNDS
BERYLLIUM NITRIDES
CHEMICAL COMPOSITION
CONTAINERS
CRUCIBLES
CRYOGENIC FLUIDS
CRYSTAL GROWTH
DIES
DIRECT ENERGY CONVERTERS
ELEMENTS
FLUIDS
IMPURITIES
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MASS SPECTROSCOPY
MATERIALS
METALS
MINERALS
MULLITE
NITRIDES
NITROGEN
NITROGEN COMPOUNDS
NONMETALS
OXYGEN
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
PHYSICAL PROPERTIES
PNICTIDES
RESEARCH PROGRAMS
SEMIMETALS
SILICON
SILICON COMPOUNDS
SILICON NITRIDES
SILICON SOLAR CELLS
SOLAR CELLS
SOLUBILITY
SPECTROSCOPY
THERMODYNAMIC PROPERTIES
VAPOR PRESSURE